Scale remover



Dec. 20, 1955 J. F. CRAWFORD SCALE REMOVER Original Filed April 28, 1945 INVENTOR JOHN E CRAWFORD, DECEASED, BY MAUDE A. CRAWFORD, EXECUTRIX.

M ATTORNEY United States Patent SCALE REMOVER John F. Crawford, deceased, late of Racine, Wis. by Maude A. Crawford, executrix, Racine, Wis., said John F. Crawford assignor to J. I. Case Company, Racine, Wis., a corporation of Wisconsin Original application April 28, 1945, Serial No. 590,896,

now Patent No. 2,545,229, dated March 13, 1951. Divided and this application March 8, 1951, Serial No. 214,603

1 Claim. (Cl. 2981) The present invention relates to a forging apparatus and is a division of the copending application to John F. Crawford, Serial No. 590,896, filed April 28, 1945, now Patent No. 2,545,229 which issued March 13, 1951.

An object of this invention is to provide means for removing scale from billets as they are passed through the forging apparatus in order that the scale will not be rolled into the surface of the forgings.

Other objects and advantages of the invention will become apparent from a consideration of the following detailed description taken in connection with the accompanying drawings wherein a satisfactory embodiment of the invention is shown. However, it is to be understood that the invention is not limited to the details disclosed, but includes all such variations and modifications as fall within the spirit of the invention as herein expressed.

In the drawings, Fig. 1 is a side elevational view of a forging machine which embraces the mechanism of the present invention. Fig. 2 is a vertical sectional view taken on the lines 22 of Fig. 1.

Fig. 3 is a vertical sectional view taken at the line 3-3 of Fig. 2.

Fig. 4 is an end view of a of the forging process.

This invention may be best understood in a preliminary way by a consideration of Fig. 1. Previously to using the machine of Fig. 1, the billets are heated in a furnace and when they have been heated to the proper temperature, they are descaled by a swelling or upsetting process fully disclosed in the above mentioned issued Patent No. 2,545,229 so as to remove the scale which would interfere with the rolling process. They are then in condition to begin the process of rolling.

A billet as it reaches the machine of Fig. 1 is of the cross sectional shape shown in Fig. 4. This figure shows an end view of the billet and which billet has arcuate corners which frequently have scale adhering to the surface thereof, notwithstanding the descaling process. It is necessary before the rolling process starts, to remove this final accumulation of scale which removal is the purpose of this invention.

billet taken at one stage As the billet is brought to the machine of Fig. 1, it is dropped into a holder 10, shown in Fig. 1. Holder 10 is carried on a swinging arm 12 which can swing from the position shown, to one indicated by dotted lines. In this latter position, the billet is located so as to be in position to be pushed between through the rollers.

A ram 14 operated by hydraulic means moves the billet 16 toward the right, as seen in Fig. 1 and as the billet moves to the right, it encounters a yoke 18 to which is secured a plate 20.

Referring to Figs. 1 and 2, plate 20 carries a series of blades 22 which, in this instance, are pivoted at the corners of plate 20 as at 24, and pulled inwardly by springs 26 so as to insure contact with the billets and allow reasonable variation in size without difiiculty.

Blades 22 have sharpened inserts 28 which serve to scrape the corners of the billet immediately before they pass between the rollers. In this way, the hot metal is substantially entirely clean when it passes between the rollers, and no scale is rolled into the material.

Plunger 14 forces billet 16 entirely through the yoke between rollers 30, the billet finally falling into a receptacle 32. Receptacle 32 is partially open at the bottom to permit any scale which may still be dropped from the billet, to be eliminated.

The above being a complete desscription of an illustrative embodiment of the invention, what is claimed as new and desired to be secured by Letters Patent of the United States is:

In a scraper the combination of an apertured plate, pintles disposed cireumferentially about and radially spaced from the aperture in said plate, scraper blades pivoted on the pintles and extending inwardly substantially tangentially to said aperture for swinging in a plane transverse to the axis of said opening, spring means urging the blades to swing about the pintles in a direction to encroach upon said aperture, said spring means being anchored in tension between adjacent scraper blades, and abutment means on the end of each scraper blade engaging the side of an adjacent scraper blade and positioned to limit the encroachment thereof upon said aperture to a predetermined amount.

References Cited in the file of this patent UNITED STATES PATENTS 997,167 Werth July 4, 1911 1,056,403 Crane Mar. 18, 1913 1,198,894 Cote Sept. 19, 1916 1,567,375 McCaslin Dec. 29, 1925 1,686,398 Stoop Oct. 2, 1928 2,059,124 Layton Oct. 27, 1936 

